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Author Topic: TL-922 problem  (Read 903 times)
HA5BZR
Member

Posts: 68




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« on: January 11, 2013, 06:44:20 AM »

Dear Friends !

Can you help me?
I turned on the linear in SSB MODE in STBY.When I switched from SSB MODE to CW
MODE at STBY and I heard a popping/crackling sound.Now in STBY MODE the IP (anod current) is 0,55A in CW
MODE and  0,85A in SSB MODE.Is it normal?
HV is good in CW and SSB.I removed the tubes but also the same IP.
Maybe the tubes are good? Why is so big IP(anod current) without driving,without tubes in STBY MODE?
 
                                                   Thanks:Laszlo HA5BZR

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KH2G
Member

Posts: 252




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« Reply #1 on: January 15, 2013, 04:55:28 PM »

According to the book, Max Ip is .35A.  I suspect Zener D2 may have shorted through. You didn't say if there had been any mods to the Amp. Tubes may be good but you have a problem. If you have the schematic you will see how D2 is most logical.
Ip is measured though shunt resistor R6 and meter deflection is via R7.
Good luck Dick KH2G
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